The Siemens 3SK12111BW20 is a SIRIUS safety relay output expansion module designed to extend the output capability of compatible safety relay systems. It provides 4 relay enabling circuits with 4 NO contacts along with a 1 NC relay signaling contact, making it suitable for safety-related machine control applications where additional switching outputs are required.
With a 110–240 V AC/DC supply voltage, screw-terminal connection and relay-based output contacts, the module can be integrated into suitable machine safety and control architectures. It is particularly useful for OEM machine builders, panel manufacturers, system integrators and industrial automation applications requiring additional relay outputs from a safety control system.
The Siemens 3SK12111BW20 safety relay output expansion module is used when a safety relay system requires additional relay outputs for controlling or signaling external circuits.
Instead of replacing the complete safety-control arrangement with a larger device, an appropriate output expansion module can provide additional switching possibilities.
The module offers four NO relay enabling contacts, allowing compatible external circuits to be switched according to the safety system's configuration. In addition, the 1 NC relay signaling contact can be used for signaling or status-related functions within the appropriate control architecture.
This makes the module useful in machinery where multiple devices or circuits need to respond to a safety-related command.
The main output capability of the 3SK12111BW20 consists of four relay enabling circuits with 4 normally open (NO) contacts.
These outputs can provide additional switching paths for compatible external circuits.
Depending on the machine design, outputs may be incorporated into functions associated with:
The exact use of each output must be determined from the safety circuit design and the applicable machine risk assessment.
In addition to the four NO enabling contacts, the 3SK12111BW20 provides one normally closed (NC) relay signaling contact.
The signaling output can be incorporated into an appropriate monitoring or indication circuit to provide information about the state of the safety relay expansion system.
For example, a signaling contact may be used within a control-panel status circuit or connected to a suitable monitoring input, depending on the system architecture.
The signaling circuit should not automatically be treated as a safety output; its actual safety function depends on the complete system design.
The 3SK12111BW20 is designed for a 110–240 V AC/DC supply voltage, providing flexibility for control systems using either AC or DC supply within the specified range.
This makes the module suitable for a variety of industrial electrical installations where the available control supply falls within its specified operating range.
Before installation, the supply requirements and wiring arrangement should be checked against the applicable Siemens documentation and the complete system configuration.
The module uses screw-terminal connections, providing a conventional and practical wiring method for industrial control panels.
Screw terminals can be convenient for panel builders and maintenance teams because they allow individual conductors to be connected and serviced directly.
Proper conductor selection, terminal tightening and wiring practices should follow the applicable installation requirements and Siemens documentation.
The Siemens SIRIUS 3SK safety system is designed for implementing safety functions in machinery and industrial automation applications.
The 3SK12111BW20 can be used as an output expansion component in compatible configurations where additional relay contacts are required.
A modular safety architecture can help machine builders create control systems that are easier to adapt to different machine requirements.
Before selecting the module, compatibility with the existing SIRIUS safety relay configuration should be verified.
The Siemens 3SK12111BW20 safety relay output expansion can be used in appropriately designed applications such as:
For OEMs and control-panel manufacturers, the 3SK12111BW20 provides a practical way to expand relay output capability within a compatible SIRIUS safety architecture.
The combination of 4 NO relay enabling contacts and 1 NC signaling contact allows multiple external circuits to be accommodated within the machine-control design.
This can be especially useful where a single safety control function needs to interact with several contactors, actuators or control circuits.
The 3SK12111BW20 should be used as part of a complete safety-related control system. Correct safety performance depends on the entire architecture, including safety inputs, logic, output devices, wiring, contactors, monitoring and restart behavior.
Machine manufacturers and system integrators should perform the required risk assessment and validate the complete safety function before commissioning the equipment.
The module should be selected and installed according to the applicable Siemens documentation and relevant machinery safety requirements.
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The 3SK12111BW20 is a Siemens SIRIUS safety relay output expansion module with relay enabling and signaling circuits.
It provides 4 NO relay enabling contacts.
Yes. It provides 1 NC relay signaling contact.
The specified supply voltage is 110–240 V AC/DC.
The module uses screw-terminal connections.
It is used to provide additional relay output circuits within a compatible safety-control architecture.
It can be incorporated into appropriately designed machine safety systems, industrial machinery, automation equipment, production lines and safety-control panels.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Model Number | 3SK1211-1BW20 |
| Variant | BW20 |
| Product Type | Output Expansion Module |
| Supply Voltage | 110–240V AC/DC |
| Output Contacts | 4 NO + 1 NC |
| Function | Safety output expansion |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Height | ~100 mm |
| Depth | ~121.6 mm |
| Terminal Type | Screw terminals |
| Operating Temperature | -25°C to +60°C |
| Protection Class | IP20 |
| Switching Capacity | Up to ~5–10 A (AC-15 dependent) |
| Standards | IEC 61508, ISO 13849-1 compliant system use |
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